﻿/* Copyright (C) 2011 by John Cronin
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:

 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

using System;
using System.Collections.Generic;
using System.Text;

namespace tysos
{
    public class Syscalls
    {
        public class SchedulerFunctions
        {
            [ABI.Syscall]
            public static void Yield()
            {
                /* Yield the timeslice of the current thread */
                Thread cur = Program.cur_cpu_data.CurrentThread;
                Scheduler sched = Program.cur_cpu_data.CurrentScheduler;
                TaskSwitcher switcher = Program.arch.Switcher;

                if (cur != null)
                    sched.Reschedule(cur);

                Thread next = sched.GetNextThread();

                if ((next != cur) && (next != null))
                    switcher.Switch(next);
            }
        }

        public class DebugFunctions
        {
            [ABI.Syscall]
            public static void Write(char ch)
            { Program.arch.BootInfoOutput.Write(ch); Program.arch.BootInfoOutput.Flush(); }
            [ABI.Syscall]
            public static void Write(string s)
            { Program.arch.BootInfoOutput.Write(s); Program.arch.BootInfoOutput.Flush(); }
            [ABI.Syscall]
            public static void DebugWrite(char ch)
            { Program.arch.DebugOutput.Write(ch); Program.arch.DebugOutput.Flush(); }
            [ABI.Syscall]
            public static void DebugWrite(string s)
            { Program.arch.DebugOutput.Write(s); Program.arch.DebugOutput.Flush(); }
        }
    }
}
